Sigma rule: Suspicious PowerShell WindowStyle Option

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-c1927b60523c, updated 2023-01-03T00:00:00.000Z.

Rule

Title: Suspicious PowerShell WindowStyle Option
Status: test
Level: medium
Author: frack113, Tim Shelton (fp AWS)
Date: 2021-10-20
Modified: 2023-01-03
File: rules/windows/powershell/powershell_script/posh_ps_susp_windowstyle.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Adversaries may use hidden windows to conceal malicious activity from the plain sight of users.
In some cases, windows that would typically be displayed when an application carries out an operation can be hidden

Log source

product: windows
category: ps_script
definition: Requirements: Script Block Logging must be enabled

Detection

selection:
    ScriptBlockText|contains|all:
        - 'powershell'
        - 'WindowStyle'
        - 'Hidden'
filter:
    ScriptBlockText|contains|all:
        - ':\Program Files\Amazon\WorkSpacesConfig\Scripts\'
        - '$PSScriptRoot\Module\WorkspaceScriptModule\WorkspaceScriptModule'
condition: selection and not filter

False positives (as the rule lists them)

Unknown

MITRE ATT&CK ids this rule names

T1564.003

References

https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1564.003/T1564.003.md

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_script/posh_ps_susp_windowstyle.yml

Sources and licences

SigmaHQ
"Suspicious PowerShell WindowStyle Option" by frack113, Tim Shelton (fp AWS) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_script/posh_ps_susp_windowstyle.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License
Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Suspicious PowerShell WindowStyle Option",
entity page, dataset version ref-c1927b60523c, updated 2023-01-03T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/313fbb0a-a341-4682-848d-6d6f8c4fab7c (accessed 2026-11-03).
Underlying source: SigmaHQ rule 313fbb0a-a341-4682-848d-6d6f8c4fab7c, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.